Anybody else running a gt42 ?

[Trbobuick]

Anybody else running a gt 42 yet ? Im convinced it will be the next " thing" in big turbos.

 

[chevyII]

Also looking for info on this turbo...what stall speed with a 274"? What wheel are you running a 76? Ever heard of a PTE47/80?

 

[Trbobuick]

I have a 258" motor with a 4400 stall. Holy christ does this thing make power at low boost. It made 530 @ 15 psi on a mustang dyno . It went 106 mph in the 1/8 mile @ 15 psi . I raced a Head and cam c6 @ 10 psi and put 3 cars on him at a 45 roll. Its very streetable but should make the power that i want. Its the 76 MM gt42 non bb from Jack Cotton. 1.01 hot side. Only bitch was finding the 5- 4 inch reducer coupler. I ordered one 2 months ago and it still isnt here !! Good thing a good buddy had one that he wasnt using.

 

[turbo2nr]

So the compressor inlet is 5"? That's huge!

 

[JCotton]

Now see Brian, you could have used that 1.20? a\r....... I have 2 more here, one I brought to the track last weekend and spoolup was awsome, not to mention the power........ By the way, give me a call at the shop when you see this, asap.
thanks

 

[Trbobuick]

Jack,

I will call monday.

 

[CTX-SLPR]

Jack you have any experience with the ball bearing version? So they have housings now for the Buick headers?

Thanks,

 

[Louie L.]

260 CI, Stock ported intake. GN1 Rs with 1200 ports. 224 Hyd with V2. ATI conv. 4000 stall i believe. GT42-76,1.01 exhaust housing. Self made 4in to 3.5in DP.

I just went 109.25 at 16 PSI 1/8 mi. 9.89 @133.4

Turbo spooled amazingly fast. I was worried about the exhaust housing side but that would not matter.

As far as reducers you can use a plumbing reducer coupler or a 5-4 in hump reducer from a truck suplier.

 

[JCotton]

Jack you have any experience with the ball bearing version? So they have housings now for the Buick headers?

Thanks,

yes, we've used them on a few cars, spool-up and performance has been excellent. Like Louie said, great numbers!!!

 

[Louie L.]

Here is the pass...

 

[TurboTR]

Can you fix the video link?

TurboTR

 

[JZ 97 SS 1500]

We have 4 customers running the GT42's in all the different trims. One is a mild street car and he is running the GT42-70. One is running the GT42-76 and the others are running the GT42-78HO. We are working with another customer now that is wanting to try the GT42-80. Should be a killer unit with a Stage engine and transbrake. The T4 1.01 seems to work good with a nice flowing setup. If you are wanting to get stupid, then the T6 1.15 is the next best thing.

JZ

 

[Louie L.]

Can you fix the video link?

TurboTR

Here is a good link




http://media.putfile.com/New-Best-GT4276-16psi

 

[chevyII]

16psi run and 16psi off the trans brake? Thanks for the info Jack

 

[Louie L.]

16psi run and 16psi off the trans brake? Thanks for the info Jack

Thats about right !

 

[Trbobuick]

Louie ,

We have close to the same combo, cam and everything. I went 106 mph in the 1/8 mile on 15 psi ,shifting at 5500 .

 

[John Wilde]

We have done ok with twin GT42/74Rs.
We expect 180MPH Plus when all the bugs are worked out.

 

[JZ 97 SS 1500]

Twin GT42's would definitely fun...hehe. John we are working on new wheels for the 74's as well. They are high boost units.

Wheels

 

[CTX-SLPR]

Do you have to mod the headers for these turbos?

Thanks,

 

[Louie L.]

Do you have to mod the headers for these turbos?

Thanks,

They are 4 bolt turbos. So a aftermarket 4bolt unit should work. Unfortunately,unless TA perf or Arizona GN make 4 bolt units there is nothing readily available. I did convert my own 3 bolt ATRs to 4 bolt. :wink: